I have to replace a "basketweave" style fence section on my property. The horizontal fence boards in the existing fence sections are 3/8" thick redwood boards (approximately 4" high, 3/8" thick, 8' long). The thin boards are easy to weave in and out of the pickets, resulting in an opaque fence with a lovely basketweave effect.

I've tried all the lumber stores nearby (San Francisco Bay Area, north Peninsula) and nobody seems to have heard of anything like these. I suspect this is a classic case of my not knowing exactly what I'm asking for. I know I could produce them by ripping Redwood 2x4s, but the prospect of ripping down 100 or more of these on my poor little table saw just isn't very inviting.

4" nominal bender board should be readily available. If the picture is of the actual installation and not simply to illustrate the basket weave technique, the boards are more like 8" nominal, compare to the adjacent CMU wall that would typically be of 8" high blocks. This material may not be as easy to find.
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bcworkzMar 26 '13 at 19:27

Yes, the days of indiscriminate Redwood harvest are over. There are specialty Redwood suppliers and they would be the best bet for obtaining the product. If you have a local lumberyard that supplies 2" x 12" Redwood planks, they might be able to order it direct for you.
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Fiasco LabsMar 26 '13 at 19:34